hardener

[barry]

i am fiberglassing a boat with polyester resin and i am unsure of how much hardenerto use. any one with any thoughts??

[Ric@Noah's]

1% to 2% depending on temperature. The hotter it is the less you use.

[GEORGESlapman]

Originally posted by Ric@Noah's:
1% to 2% depending on temperature. The hotter it is the less you use.

I was told by the supplier that I purchased my resin and mat from not to adjust my mix. He only informed me that variances in temperature varied my working time i.e.- 70 degrees, 15 minutes working time, 90 degrees, 5 minutes working time. Please set me straight.

[Ric@Noah's]

You can vary the amount of catalyst in polyester resin to control working time. With Epoxy Resins you should not change the mixing ratio. I think your supplier has confused the resins. Are you sure you have Polyester Resin?